Well, manhwa is Korean comics and corn is a type of crop. There's really no obvious relationship between the two. Maybe in some very specific and rare context there could be, but generally speaking, they're completely different things.
Manhwa and hen? There's no typical or common relationship between them. Manhwa is about visual storytelling and hen is an animal. It's hard to imagine how they could be related in any meaningful way.
Manhwa and erb are quite distinct. Manhwa focuses on visual storytelling. But erb, without further clarification, doesn't have a clear link to manhwa. Maybe erb is a name, a code, or something else that's not inherently related to the world of manhwa.
Manhwa and anime are both forms of visual storytelling. Manhwa is from Korea, while anime is typically from Japan. They have some similarities but also distinct cultural and artistic differences.